|
|
23#
發表於 2009-3-26 01:29 PM
| 只看該作者
pure math公仔箱論壇9 a% m. I5 J( A( ~$ y4 t
5 Y2 i& [6 ?! g J; i
[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y
: R6 M$ x& Z" l, |5.39.217.77公仔箱論壇0 d8 e& `' T0 ]$ T7 f
if x = 111 y = 2222, you number is 111-2222 |
|